80 results found
Crake A, Christoforidis KC, Godin R, et al., 2019, Titanium dioxide/carbon nitride nanosheet nanocomposites for gas phase CO2 photoreduction under UV-visible irradiation, APPLIED CATALYSIS B-ENVIRONMENTAL, Vol: 242, Pages: 369-378, ISSN: 0926-3373
Crake A, Christoforidis KC, Gregg A, et al., 2019, The Effect of Materials Architecture in TiO2 /MOF Composites on CO2 Photoreduction and Charge Transfer., Small
CO2 photoreduction to C1 /C1+ energized molecules is a key reaction of solar fuel technologies. Building heterojunctions can enhance photocatalysts performance, by facilitating charge transfer between two heterojunction phases. The material parameters that control this charge transfer remain unclear. Here, it is hypothesized that governing factors for CO2 photoreduction in gas phase are: i) a large porosity to accumulate CO2 molecules close to catalytic sites and ii) a high number of "points of contact" between the heterojunction components to enhance charge transfer. The former requirement can be met by using porous materials; the latter requirement by controlling the morphology of the heterojunction components. Hence, composites of titanium oxide or titanate and metal-organic framework (MOF), a highly porous material, are built. TiO2 or titanate nanofibers are synthesized and MOF particles are grown on the fibers. All composites produce CO under UV-vis light, using H2 as reducing agent. They are more active than their component materials, e.g., ≈9 times more active than titanate. The controlled composites morphology is confirmed and transient absorption spectroscopy highlights charge transfer between the composite components. It is demonstrated that electrons transfer from TiO2 into the MOF, and holes from the MOF into TiO2 , as the MOF induces band bending in TiO2 .
Dias E, Christoforidis K, Francas L, et al., 2018, Tuning thermally treated graphitic carbon nitride for H₂ evolution and CO₂ photoreduction: The effects of material properties and mid-gap states, ACS Applied Energy Materials, Vol: 1, Pages: 6524-6534, ISSN: 2574-0962
Graphitic carbon nitride (g-C3N4) is regarded as an attractive photocatalyst for solar fuel production, i.e., H2 evolution and CO2 photoreduction. Yet, its structural, chemical and optoelectronic properties are very much dependent on the synthesis method and are likely to contribute differently whether H2 evolution or CO2 reduction is considered. Little is known about this aspect making it difficult to tailor g-C3N4 structure and chemistry for a specific photoreaction. Herein, we create g-C3N4 of varying chemical, structural and optical features by applying specific thermal treatments and investigating the effects of the materials properties on solar fuel production. The samples were characterized across scales using spectroscopic, analytical and imaging tools, with particular attention given to the analyses of trap states. In the case of H2 evolution, the reaction is controlled by light absorption and charge separation enabled by the presence of trap states created by N vacancies. In the case of CO2 photoreduction, reactant adsorption appears as a dominating factor. The analyses also suggest that the thermal treatment leads to the formation of trap states located close to the valence band of g-C3N4.
Papoulis D, Panagiotaras D, Tsigrou P, et al., 2018, Halloysite and sepiolite -TiO2 nanocomposites: Synthesis characterization and photocatalytic activity in three aquatic wastes, MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, Vol: 85, Pages: 1-8, ISSN: 1369-8001
Stafford J, Patapas A, Uzo N, et al., 2018, Towards scale-up of graphene production via nonoxidizing liquid exfoliation methods, AICHE JOURNAL, Vol: 64, Pages: 3246-3276, ISSN: 0001-1541
Butler E, Reid B, Petit C, et al., 2018, Extended DLVO interactions of a metal-organic framework: Implications on colloidal dispersion, 256th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nanoscience, Nanotechnology and Beyond, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Christoforidis KC, Syrgiannis Z, La Parola V, et al., 2018, Metal-free dual-phase full organic carbon nanotubes/g-C3N4 heteroarchitectures for photocatalytic hydrogen production, NANO ENERGY, Vol: 50, Pages: 468-478, ISSN: 2211-2855
Evans A, Luebke R, Petit C, 2018, The use of metal-organic frameworks for CO purification, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 6, Pages: 10570-10594, ISSN: 2050-7488
Petit C, 2018, Present and future of MOF research in the field of adsorption and molecular separation, CURRENT OPINION IN CHEMICAL ENGINEERING, Vol: 20, Pages: 132-142, ISSN: 2211-3398
Marchesini S, McGilvery CM, Bailey J, et al., 2017, Template-Free Synthesis of Highly Porous Boron Nitride: Insights into Pore Network Design and Impact on Gas Sorption, ACS NANO, Vol: 11, Pages: 10003-10011, ISSN: 1936-0851
Crake A, Christoforidis KC, Kafizas A, et al., 2017, CO2 capture and photocatalytic reduction using bifunctional TiO2/MOF nanocomposites under UV-vis irradiation, Applied Catalysis B: Environmental, Vol: 210, Pages: 131-140, ISSN: 0926-3373
TiO2 nanosheets and metal-organic framework (NH2-UiO-66) were effectively coupled via an in‐situ growth strategy to form bifunctional materials for the combined capture and photocatalytic reduction of CO2 under UV–vis light irradiation. This was done to take advantage of the high CO2 adsorption capacity of the MOF and the photocatalytic properties of pre-formed TiO2 nanosheets in a single material. The prepared materials were thoroughly characterized using a variety of techniques. They were subsequently tested for CO2 adsorption and CO2 photocatalytic reduction using a heterogeneous gas/solid set-up to imitate both CO2 capture and fixation in a single process. The adopted synthesis process allowed the development of a tight interaction between TiO2 and NH2-UiO-66 forming a heterojunction, while maintaining both the high CO2 uptake and porosity of NH2-UiO-66. The nanocomposites were proven durable and significantly more efficient in reducing CO2 to CO than their single components. Photocatalytic activity was greatly affected by the nanocomposites composition with the optimum TiO2 content doubling the CO evolution rate compared with the pure TiO2. The improved photoactivity was assigned to the enhanced abundance of long lived charge carriers, as revealed by transient absorption spectroscopy (TAS). This most likely occurred due to the effective charge transfer via interface. A possible mechanism is discussed on the basis of the combined catalytic, spectroscopic and CO2 adsorption results.
Leeson D, Mac Dowell N, Shah N, et al., 2017, A Techno-economic analysis and systematic review of carbon capture and storage (CCS) applied to the iron and steel, cement, oil refining and pulp and paper industries, as well as other high purity sources, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 61, Pages: 71-84, ISSN: 1750-5836
Marchesini S, Regoutz A, Payne D, et al., 2017, Tunable porous boron nitride: Investigating its formation and its application for gas adsorption, MICROPOROUS AND MESOPOROUS MATERIALS, Vol: 243, Pages: 154-163, ISSN: 1387-1811
Woodward RT, Jobbe-Duval A, Marchesini S, et al., 2017, Hypercrosslinked polyHIPEs as precursors to designable, hierarchically porous carbon foams, POLYMER, Vol: 115, Pages: 146-153, ISSN: 0032-3861
Leeson D, Fennell P, Shah N, et al., 2017, A Techno-economic analysis and systematic review of carbon capture and storage (CCS) applied to the iron and steel, cement, oil refining and pulp and paper industries., 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 6297-6302, ISSN: 1876-6102
Marchesini S, Blunt M, Petit C, Investigation of the Formation of Porous Boron Nitride and Its Application for Oil/Water Separation, AIChE Fall meeting 2016
Dias E, Petit C, Investigation of the Use of Metal-Organic Frameworks for Combined Water Purification and Catalytic H2 Production, AIChE Fall meeting 2016
Crake A, Petit C, Bifunctional Porous Materials for Combined CO2 Capture and Catalytic Conversion, AIChE Fall meeting 2016
Evans A, Luebke R, Hellgardt K, et al., Investigation of the Dynamic Adsorption of CO Using Metal-Organic Frameworks, AIChE Fall meeting 2016
Woodward RT, Fam DWH, Anthony DB, et al., 2016, Hierarchically porous carbon foams from pickering high internal phase emulsions, CARBON, Vol: 101, Pages: 253-260, ISSN: 0008-6223
Smit B, Graham R, Styring P, et al., 2016, CCS - A technology for the future: general discussion, FARADAY DISCUSSIONS, Vol: 192, Pages: 303-335, ISSN: 1359-6640
Hong J, Chen C, Bedoya FE, et al., 2016, Carbon nitride nanosheet/metal-organic framework nanocomposites with synergistic photocatalytic activities, CATALYSIS SCIENCE & TECHNOLOGY, Vol: 6, Pages: 5042-5051, ISSN: 2044-4753
Dias EM, Petit C, 2016, Towards the use of metal-organic frameworks for water reuse: a review of the recent advances in the field of organic pollutants removal and degradation and the next steps in the field (vol 3, pg 22484, 2015), JOURNAL OF MATERIALS CHEMISTRY A, Vol: 4, Pages: 3565-3565, ISSN: 2050-7488
Wang J, Petit C, Zhang X, et al., 2016, Phase Equilibrium Study of the AlCl3-CaCl2-H2O System for the Production of Aluminum Chloride Hexahydrate from Ca-Rich Flue Ash, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 61, Pages: 359-369, ISSN: 0021-9568
Park A-H, Gao M, Petit C, 2015, Chemical and physical characterizations of liquid-like nanoparticle organic hybrid materials (NOHMs) designed for CO2 capture and conversion, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Marchesini S, Bolton L, Petit C, White Graphene As a Novel Type of Adsorbent, AIChE Fall meeting 2015
Petit C, Bandosz TJ, 2015, Engineering the surface of a new class of adsorbents: Metal-organic framework/graphite oxide composites, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 447, Pages: 139-151, ISSN: 0021-9797
Lin K-YA, Yang H, Petit C, et al., 2015, Removal of oil droplets from water using carbonized rice husk: enhancement by surface modification using polyethylenimine, ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, Vol: 22, Pages: 8316-8328, ISSN: 0944-1344
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